Screw Cube is an idea by Alex Polonsky. It is basically a 2x2x3 puzzle with eight identical corner pieces that can screw up and down the 1x2x2 base puzzle. As the corner pieces are blocked at the end of the thread after four turns, this makes this puzzle a sort-of Constrained Cube
Watch the YouTube video
Read at the Shapeways Forum
Read more at the Twisty Puzzles Forum
Please contact Oskar
directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.